#include "ssd1306.h"

// Write command to OLED
static void WriteCommand(unsigned char command)
{
  SSD_CS_Low();
  SSD_A0_Low();
  SPI_SendByte(command);
  SSD_CS_High();
}

// Write data to OLED
static void WriteData(unsigned char data)
{
  SSD_CS_Low();
  SSD_A0_High();
  SPI_SendByte(data);
  SSD_CS_High();
}

// Initialize OLED
void ssd1306_init(void)
{

  /* Generate a reset */
  SSD_Reset_Low();
  uint32_t i;
  for(i=5000; i>1; i--) 
  SSD_Reset_High();

  WriteCommand(0xAE);
  WriteCommand(0xD5);
  WriteCommand(0x80);
  WriteCommand(0xA8);
  WriteCommand(0x1F);
  WriteCommand(0xD3);
  WriteCommand(0x00);
  WriteCommand(0x40 | 0x00); // line #0
  WriteCommand(0x8D);
  WriteCommand(0x14); //10 or 14 if not externalvcc
  WriteCommand(0x20);
  WriteCommand(0x00);
//  WriteCommand(0xA0 | 0x1); // segremap (normal)
  WriteCommand(0xA0); // segremap (flip)
//  WriteCommand(0xC8); // comscandec (normal)
  WriteCommand(0xC0); // comscandec (flip)
  WriteCommand(0xDA); // setcompins 
  WriteCommand(0x02);
  WriteCommand(0x81); // contrast
  WriteCommand(0x0F); // contrast value. 8f is a good one.
  WriteCommand(0xD9);
  WriteCommand(0xF1); //22 or F1 if not externalvcc
  WriteCommand(0xDB);
  WriteCommand(0x40);
  WriteCommand(0xA4); // dispalyallon_resume
  WriteCommand(0xA6); // normaldisplay


  WriteCommand(0xAF); // display on 
}


// Times New Roman font
static const char fontData[][5] =
{                                       // Refer to "Times New Roman" Font Database
                                        //   Basic Characters
    {0x00,0x00,0x00,0x00,0x00},         //   (  0)    - 0x0020 No-Break Space
    {0x00,0x00,0x4F,0x00,0x00},         //   (  1)  ! - 0x0021 Exclamation Mark
    {0x00,0x07,0x00,0x07,0x00},         //   (  2)  " - 0x0022 Quotation Mark
    {0x14,0x7F,0x14,0x7F,0x14},         //   (  3)  # - 0x0023 Number Sign
    {0x24,0x2A,0x7F,0x2A,0x12},         //   (  4)  $ - 0x0024 Dollar Sign
    {0x23,0x13,0x08,0x64,0x62},         //   (  5)  % - 0x0025 Percent Sign
    {0x36,0x49,0x55,0x22,0x50},         //   (  6)  & - 0x0026 Ampersand
    {0x00,0x05,0x03,0x00,0x00},         //   (  7)  ' - 0x0027 Apostrophe
    {0x00,0x1C,0x22,0x41,0x00},         //   (  8)  ( - 0x0028 Left Parenthesis
    {0x00,0x41,0x22,0x1C,0x00},         //   (  9)  ) - 0x0029 Right Parenthesis
    {0x14,0x08,0x3E,0x08,0x14},         //   ( 10)  * - 0x002A Asterisk
    {0x08,0x08,0x3E,0x08,0x08},         //   ( 11)  + - 0x002B Plus Sign
    {0x00,0x50,0x30,0x00,0x00},         //   ( 12)  , - 0x002C Comma
    {0x08,0x08,0x08,0x08,0x08},         //   ( 13)  - - 0x002D Hyphen-Minus
    {0x00,0x60,0x60,0x00,0x00},         //   ( 14)  . - 0x002E Full Stop
    {0x20,0x10,0x08,0x04,0x02},         //   ( 15)  / - 0x002F Solidus
    {0x3E,0x51,0x49,0x45,0x3E},         //   ( 16)  0 - 0x0030 Digit Zero
    {0x00,0x42,0x7F,0x40,0x00},         //   ( 17)  1 - 0x0031 Digit One
    {0x42,0x61,0x51,0x49,0x46},         //   ( 18)  2 - 0x0032 Digit Two
    {0x21,0x41,0x45,0x4B,0x31},         //   ( 19)  3 - 0x0033 Digit Three
    {0x18,0x14,0x12,0x7F,0x10},         //   ( 20)  4 - 0x0034 Digit Four
    {0x27,0x45,0x45,0x45,0x39},         //   ( 21)  5 - 0x0035 Digit Five
    {0x3C,0x4A,0x49,0x49,0x30},         //   ( 22)  6 - 0x0036 Digit Six
    {0x01,0x71,0x09,0x05,0x03},         //   ( 23)  7 - 0x0037 Digit Seven
    {0x36,0x49,0x49,0x49,0x36},         //   ( 24)  8 - 0x0038 Digit Eight
    {0x06,0x49,0x49,0x29,0x1E},         //   ( 25)  9 - 0x0039 Dight Nine
    {0x00,0x36,0x36,0x00,0x00},         //   ( 26)  : - 0x003A Colon
    {0x00,0x56,0x36,0x00,0x00},         //   ( 27)  ; - 0x003B Semicolon
    {0x08,0x14,0x22,0x41,0x00},         //   ( 28)  < - 0x003C Less-Than Sign
    {0x14,0x14,0x14,0x14,0x14},         //   ( 29)  = - 0x003D Equals Sign
    {0x00,0x41,0x22,0x14,0x08},         //   ( 30)  > - 0x003E Greater-Than Sign
    {0x02,0x01,0x51,0x09,0x06},         //   ( 31)  ? - 0x003F Question Mark
    {0x32,0x49,0x79,0x41,0x3E},         //   ( 32)  @ - 0x0040 Commercial At
    {0x7E,0x11,0x11,0x11,0x7E},         //   ( 33)  A - 0x0041 Latin Capital Letter A
    {0x7F,0x49,0x49,0x49,0x36},         //   ( 34)  B - 0x0042 Latin Capital Letter B
    {0x3E,0x41,0x41,0x41,0x22},         //   ( 35)  C - 0x0043 Latin Capital Letter C
    {0x7F,0x41,0x41,0x22,0x1C},         //   ( 36)  D - 0x0044 Latin Capital Letter D
    {0x7F,0x49,0x49,0x49,0x41},         //   ( 37)  E - 0x0045 Latin Capital Letter E
    {0x7F,0x09,0x09,0x09,0x01},         //   ( 38)  F - 0x0046 Latin Capital Letter F
    {0x3E,0x41,0x49,0x49,0x7A},         //   ( 39)  G - 0x0047 Latin Capital Letter G
    {0x7F,0x08,0x08,0x08,0x7F},         //   ( 40)  H - 0x0048 Latin Capital Letter H
    {0x00,0x41,0x7F,0x41,0x00},         //   ( 41)  I - 0x0049 Latin Capital Letter I
    {0x20,0x40,0x41,0x3F,0x01},         //   ( 42)  J - 0x004A Latin Capital Letter J
    {0x7F,0x08,0x14,0x22,0x41},         //   ( 43)  K - 0x004B Latin Capital Letter K
    {0x7F,0x40,0x40,0x40,0x40},         //   ( 44)  L - 0x004C Latin Capital Letter L
    {0x7F,0x02,0x0C,0x02,0x7F},         //   ( 45)  M - 0x004D Latin Capital Letter M
    {0x7F,0x04,0x08,0x10,0x7F},         //   ( 46)  N - 0x004E Latin Capital Letter N
    {0x3E,0x41,0x41,0x41,0x3E},         //   ( 47)  O - 0x004F Latin Capital Letter O
    {0x7F,0x09,0x09,0x09,0x06},         //   ( 48)  P - 0x0050 Latin Capital Letter P
    {0x3E,0x41,0x51,0x21,0x5E},         //   ( 49)  Q - 0x0051 Latin Capital Letter Q
    {0x7F,0x09,0x19,0x29,0x46},         //   ( 50)  R - 0x0052 Latin Capital Letter R
    {0x46,0x49,0x49,0x49,0x31},         //   ( 51)  S - 0x0053 Latin Capital Letter S
    {0x01,0x01,0x7F,0x01,0x01},         //   ( 52)  T - 0x0054 Latin Capital Letter T
    {0x3F,0x40,0x40,0x40,0x3F},         //   ( 53)  U - 0x0055 Latin Capital Letter U
    {0x1F,0x20,0x40,0x20,0x1F},         //   ( 54)  V - 0x0056 Latin Capital Letter V
    {0x3F,0x40,0x38,0x40,0x3F},         //   ( 55)  W - 0x0057 Latin Capital Letter W
    {0x63,0x14,0x08,0x14,0x63},         //   ( 56)  X - 0x0058 Latin Capital Letter X
    {0x07,0x08,0x70,0x08,0x07},         //   ( 57)  Y - 0x0059 Latin Capital Letter Y
    {0x61,0x51,0x49,0x45,0x43},         //   ( 58)  Z - 0x005A Latin Capital Letter Z
    {0x00,0x7F,0x41,0x41,0x00},         //   ( 59)  [ - 0x005B Left Square Bracket
    {0x02,0x04,0x08,0x10,0x20},         //   ( 60)  \ - 0x005C Reverse Solidus
    {0x00,0x41,0x41,0x7F,0x00},         //   ( 61)  ] - 0x005D Right Square Bracket
    {0x04,0x02,0x01,0x02,0x04},         //   ( 62)  ^ - 0x005E Circumflex Accent
    {0x40,0x40,0x40,0x40,0x40},         //   ( 63)  _ - 0x005F Low Line
    {0x01,0x02,0x04,0x00,0x00},         //   ( 64)  ` - 0x0060 Grave Accent
    {0x20,0x54,0x54,0x54,0x78},         //   ( 65)  a - 0x0061 Latin Small Letter A
    {0x7F,0x48,0x44,0x44,0x38},         //   ( 66)  b - 0x0062 Latin Small Letter B
    {0x38,0x44,0x44,0x44,0x20},         //   ( 67)  c - 0x0063 Latin Small Letter C
    {0x38,0x44,0x44,0x48,0x7F},         //   ( 68)  d - 0x0064 Latin Small Letter D
    {0x38,0x54,0x54,0x54,0x18},         //   ( 69)  e - 0x0065 Latin Small Letter E
    {0x08,0x7E,0x09,0x01,0x02},         //   ( 70)  f - 0x0066 Latin Small Letter F
    {0x06,0x49,0x49,0x49,0x3F},         //   ( 71)  g - 0x0067 Latin Small Letter G
    {0x7F,0x08,0x04,0x04,0x78},         //   ( 72)  h - 0x0068 Latin Small Letter H
    {0x00,0x44,0x7D,0x40,0x00},         //   ( 73)  i - 0x0069 Latin Small Letter I
    {0x20,0x40,0x44,0x3D,0x00},         //   ( 74)  j - 0x006A Latin Small Letter J
    {0x7F,0x10,0x28,0x44,0x00},         //   ( 75)  k - 0x006B Latin Small Letter K
    {0x00,0x41,0x7F,0x40,0x00},         //   ( 76)  l - 0x006C Latin Small Letter L
    {0x7C,0x04,0x18,0x04,0x7C},         //   ( 77)  m - 0x006D Latin Small Letter M
    {0x7C,0x08,0x04,0x04,0x78},         //   ( 78)  n - 0x006E Latin Small Letter N
    {0x38,0x44,0x44,0x44,0x38},         //   ( 79)  o - 0x006F Latin Small Letter O
    {0x7C,0x14,0x14,0x14,0x08},         //   ( 80)  p - 0x0070 Latin Small Letter P
    {0x08,0x14,0x14,0x18,0x7C},         //   ( 81)  q - 0x0071 Latin Small Letter Q
    {0x7C,0x08,0x04,0x04,0x08},         //   ( 82)  r - 0x0072 Latin Small Letter R
    {0x48,0x54,0x54,0x54,0x20},         //   ( 83)  s - 0x0073 Latin Small Letter S
    {0x04,0x3F,0x44,0x40,0x20},         //   ( 84)  t - 0x0074 Latin Small Letter T
    {0x3C,0x40,0x40,0x20,0x7C},         //   ( 85)  u - 0x0075 Latin Small Letter U
    {0x1C,0x20,0x40,0x20,0x1C},         //   ( 86)  v - 0x0076 Latin Small Letter V
    {0x3C,0x40,0x30,0x40,0x3C},         //   ( 87)  w - 0x0077 Latin Small Letter W
    {0x44,0x28,0x10,0x28,0x44},         //   ( 88)  x - 0x0078 Latin Small Letter X
    {0x0C,0x50,0x50,0x50,0x3C},         //   ( 89)  y - 0x0079 Latin Small Letter Y
    {0x44,0x64,0x54,0x4C,0x44},         //   ( 90)  z - 0x007A Latin Small Letter Z
    {0x00,0x08,0x36,0x41,0x00},         //   ( 91)  { - 0x007B Left Curly Bracket
    {0x00,0x00,0x7F,0x00,0x00},         //   ( 92)  | - 0x007C Vertical Line
    {0x00,0x41,0x36,0x08,0x00},         //   ( 93)  } - 0x007D Right Curly Bracket
    {0x02,0x01,0x02,0x04,0x02},         //   ( 94)  ~ - 0x007E Tilde
    {0x08,0x14,0x2A,0x14,0x22},         //   ( 95) << - 0x00AB Left-Pointing Double Angle Quotation Mark
    {0x00,0x02,0x05,0x02,0x00},         //   ( 96)    - 0x00B0 Degree Sign
//    {0x44,0x44,0x5F,0x44,0x44},         //   ( 97) +- - 0x00B1 Plus-Minus Sign
//    {0x7E,0x20,0x20,0x10,0x3E},         //   ( 98)  u - 0x00B5 Micro Sign
//    {0x22,0x14,0x2A,0x14,0x08},         //   ( 99) >> - 0x00BB Right-Pointing Double Angle Quotation Mark
//    {0x30,0x48,0x45,0x40,0x20},         //   (100)  ? - 0x00BF Inverted Question Mark
//    {0x22,0x14,0x08,0x14,0x22},         //   (101)  x - 0x00D7 Multiplcation Sign
//    {0x08,0x08,0x2A,0x08,0x08},         //   (102)  + - 0x00F7 Division Sign
//    {0x18,0x14,0x08,0x14,0x0C},         //   (103)    - 0x221E Infinity
//    {0x44,0x4A,0x4A,0x51,0x51},         //   (104)  < - 0x2264 Less-Than or Equal to
//    {0x51,0x51,0x4A,0x4A,0x44},         //   (105)  > - 0x2265 Greater-Than or Equal to
//    {0x54,0x14,0x64,0x08,0x70},         //   (106)  .: - RF Symbol
//    {0x70,0x7C,0x72,0x7C,0x70},         //   (107)  ^ - Lock symbol
//    {0x70,0x5C,0x52,0x54,0x70},         //   (108)  / - Unlock symbol
//    {0x0C,0x1E,0x3C,0x1E,0x0C},         //   (109)  <3 - Heart Symbol
//    {0x18,0x22,0xFF,0x12,0x0C},         //   (110)  U - USB Symbol
};


static void setStartPage(unsigned char d)
{
    WriteCommand(0xB0|d);       // Set Page Start Address for Page Addressing Mode
                                // Default => 0xB0 (0x00)
}
/* Below are functions used to configure the OLED */
static void setStartColumn(unsigned char d)
{
    WriteCommand(0x00+d%16);    // Set Lower Column Start Address for Page Addressing Mode
    WriteCommand(0x10+d/16);    // Set Higher Column Start Address for Page Addressing Mode
                                // Default => 0x10
}


const uint8_t row[4][32] = { 

	{0x00,0x00,0x01,0x03,0x07,0x0F,0x1E,0x3C,0x3C,0x7C,0x7C,0x7C,0xFC,0xFF,0xFF,0xFC,0xFC,0xFC,0xFC,0xFF,0x7F,0x7F,0x7F,0x3C,0x3C,0x1C,0x0C,0x06,0x03,0x01,0x00,0x00},

	{0x0F,0x7F,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x3F,0x3F,0x7F,0xFF,0xFF,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x7F,0x0F},

	{0xF0,0xFE,0xFF,0xFF,0xFF,0xC7,0x00,0x00,0x00,0x00,0x87,0xC7,0xC7,0xFF,0xFF,0x00,0x00,0x00,0x00,0x87,0x87,0xC7,0xC3,0x03,0x07,0x07,0x0F,0x7F,0xFF,0xFF,0xFE,0xF0},

	{0x00,0x00,0x80,0xC0,0xE0,0xF0,0xF8,0xFC,0xFC,0xFE,0xFE,0xFE,0xFF,0xFF,0xFF,0x1F,0x1F,0x1F,0x1F,0xFF,0xFE,0xFE,0xFE,0xFC,0xFC,0xF8,0xF0,0xE0,0xC0,0x80,0x00,0x00},

};

void ssd1306_clearscreen()
{
    uint8_t i = 0;
    uint8_t page = 0;
    for(page = 0; page<4; page++)
    {
        setStartPage(page);
        setStartColumn(0);
        for(i = 0; i<128; i++)
        {
            WriteData(0x00);
        }
    }
    WriteData(0x00);
}

void ssd1306_drawlogo()
{
    uint8_t i = 0;
    setStartPage(3);
    setStartColumn(0);
    for(i = 0; i<32; i++)
    {
        WriteData(row[0][i]);
    }

    WriteData(0x00);

    setStartPage(2);
    setStartColumn(0);
    for(i = 0; i<32; i++)
    {
        WriteData(row[1][i]);
    }
    WriteData(0x00);

    setStartPage(1);
    setStartColumn(0);
    for(i = 0; i<32; i++)
    {
        WriteData(row[2][i]);
    }
    WriteData(0x00);

    setStartPage(0);
    setStartColumn(0);
    for(i = 0; i < 32; i++)
    {
        WriteData(row[3][i]);
    }
    WriteData(0x00);
}

/* Print a single character from font.cpp */
void ssd1306_drawchar(char ascii, unsigned char row, unsigned char xPos)
{
    const char *srcPointer = (char*)-1;

    srcPointer = &fontData[(ascii-32)][0];

    setStartPage(row);
    setStartColumn(xPos);

    for(uint8_t i = 0; i < 5; i++)
    {
        WriteData(*srcPointer);
        srcPointer++;
    }
    WriteData(0x00);
}

void ssd1306_drawcharbig(char ascii, unsigned char row, unsigned char xPos)
{
    const char *srcPointer = (char*)-1;

    srcPointer = &fontData[(ascii-32)][0];

    setStartPage(row-1);
    setStartColumn(xPos);

    // Write first row
    for(uint8_t i = 0; i < 5; i++)
    {
        uint8_t data = 0;
        data |= ((*srcPointer) & 0b1000) << 4; // get top 4 bits
        data |= ((*srcPointer) & 0b1000) << 3; // get top 4 bits

        data |= ((*srcPointer) & 0b0100) << 3; // get top 4 bits
        data |= ((*srcPointer) & 0b0100) << 2; // get top 4 bits

        data |= ((*srcPointer) & 0b0010) << 2; // get top 4 bits
        data |= ((*srcPointer) & 0b0010) << 1; // get top 4 bits

        data |= ((*srcPointer) & 0b0001) << 1; // get top 4 bits
        data |= ((*srcPointer) & 0b0001); // get top 4 bits

        WriteData(data);
        WriteData(data);

        srcPointer++;
    }
    WriteData(0x00);

    srcPointer -= 5;

    setStartPage(row);
    setStartColumn(xPos);

    // Write second row
    for(uint8_t i = 0; i < 5; i++)
    {
        uint8_t data = 0;
        data |=  (*srcPointer) & 0b10000000; // get top 4 bits
        data |= ((*srcPointer) & 0b10000000) >> 1; // get top 4 bits

        data |= ((*srcPointer) & 0b01000000) >> 1; // get top 4 bits
        data |= ((*srcPointer) & 0b01000000) >> 2; // get top 4 bits

        data |= ((*srcPointer) & 0b00100000) >> 2; // get top 4 bits
        data |= ((*srcPointer) & 0b00100000) >> 3; // get top 4 bits

        data |= ((*srcPointer) & 0b00010000) >> 3; // get top 4 bits
        data |= ((*srcPointer) & 0b00010000) >> 4; // get top 4 bits

        WriteData(data);
        WriteData(data);

        srcPointer++;
    }
    WriteData(0x00);
 
}

void ssd1306_drawstring(const char *dataPtr, unsigned char row, unsigned char xPos)
{
    char *srcPointer;

    srcPointer = (char*)dataPtr;
    ssd1306_drawchar(' ',row,xPos); // NBSP must be written first before the string start

    while(1)
    {
        ssd1306_drawchar(*srcPointer,row,xPos);
        srcPointer++;
        xPos+=6;
        if(*srcPointer == 0) break;
    }
}


void ssd1306_drawstringbig(const char *dataPtr, unsigned char row, unsigned char xPos)
{
    char *srcPointer;

    srcPointer = (char*)dataPtr;
    ssd1306_drawcharbig(' ',row,xPos); // NBSP must be written first before the string start

    while(1)
    {
        ssd1306_drawcharbig(*srcPointer,row,xPos);
        srcPointer++;
        xPos+=12;
        if(*srcPointer == 0) break;
    }
}


// vim:softtabstop=4 shiftwidth=4 expandtab